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The area of land drained by a river is called a "catchment area". It is so-called because is the the area that catches the precipitation (rainfall).Another term is "river basin", but this is less specific.(The geographical term, "catchment area", is often used to describe the area served by, say, a school or hospital).
exactly what you said the main stream and tributaries
Drainage Basin
Oh, dude, that's easy! The term you're looking for is "watershed." It's like the VIP section for all the water that gets drained by a river. So, yeah, next time you're at a party and someone asks about the area drained by a river, just drop the term "watershed" and watch them be like, "Whoa, this person knows their stuff!"
I believe its called a water shed but I'm not completely sure about that.AnswerA watershed (one word) is a ridge or other dividing line between stream catchments, although the term is (confusingly) also applied to the catchment area. Another term is drainage basin.
A Tributary is freshwater stream that feed into a lager stream or river. The larger, or parent river is called mainstream. The point where a tributary mets the mainstream is called the confluence. Tributaries do not flow directly to ocean. Example of mainstream is Ganga in India. The term distributary means when a river separates from the mainstream and forms an another river is known as distributary
a dry river bed
a tributary is a stream coming off a river, and drainage means to drain(duh),e.g water can be drained
A small freshwater river or stream flowing into a larger river is called a tributary or feeder river. A tributary is a stream or river that flows into a mainstem (or parent) river or a lake. For example, a tributary can be a creek that flows into a river. Or it can be a small river that flows into a larger river. A tributary does not flow directly into a sea or ocean. Some large rivers can have up to 100 tributaries. The spot where the smaller and larger river meet is called a "confluence". In contrast, a body of water that branches off and flows away from the main river is called a distributary.
Tributaries
a drainage basin is where water from rain fall or snow melting drains downhill into a river or stream, or another kind of body of water.http:/en.wikipedia.org/wiki/Drainage_basin a ocean basin is technically anywhere on earth that is covered by seawater. but according to the geologist an ocean basin is below sea level.http:/en.wikipedia.org/wiki/Ocean_basin
farter